FERRITIC STAINLESS STEEL HAVING EXCELLENT CORROSION RESISTANCE IN CONDENSED WATER ENVIRONMENT PRODUCED BY EXHAUST GAS FROM HYDROCARBON COMBUSTION

摘要

Disclosed is ferritic stainless steel which has excellent corrosion resistance in a condensed water environment produced by an exhaust gas from hydrocarbon combustion, said condensed water environment being typified by the use environment of a member for a secondary heat exchanger. Specifically disclosed is ferritic stainless steel which contains, in mass%, 0.030% or less of C, 0.030% or less of N, 0.4% or less of Si, 0.01-0.5% of Mn, 0.05% or less of P, 0.01% or less of S, 16-24% of Cr, 0.3-3% of Mo, 0.05-0.25% of Ti, 0.05-0.50% of Nb, 0.01-0.2% of Al and 0.4% or less of Cu, with the balance made up of Fe and unavoidable impurities. The ferritic stainless steel satisfies formula (A): Cr + Mo + 10Ti = 18 and formula (B): Si + Cu = 0.5.